Home Postcodes by state NSW 2590 Postcode 2590 2590 is the postcode for 3 localities in NSW: Bethungra, Cootamundra and Illabo. Localities with postcode 2590BethungraNSWCootamundraNSWIllaboNSW Postcode 2590 State or territory New South Wales (NSW) Localities 3 Council area Junee; Cootamundra-Gundagai Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2588 · Postcode 2594